A quick check of Autotrader yields 3 awd xc70's less than $6000, the best of them is a 2000 with 139,000 miles. His grandma owned it before he did, so he says. At any rate you get the viscous coupling awd. The awd computer measures relative speeds of the individual tires and applies pwr to the appropriate wheel. Hence, circumference of the individual tires is a big concern as the coupling and computer reads divergent relative speeds. Whatever you do don't drive on the space saver for any length of time. You must keep a set of tires on the car with even wear. That means buying a new set of tires if you have a blow out on one that can't be repaired.

It's a low pressure turbo. As for the fly by wire throttle issue, simply take it to a volvo dlr and they'll tell you if the recall was ever done on the car. The fix takes care of the issue altogether.

As Klaus mentioned the car sits 2 inches higher than the fwd models so mileage is compromised for a slightly enhanced ability to go off road.

I owned a 2000 awd and liked it inspite of having to repair the viscous coupling at a cost of $4000. The alternative to that repair is to simply remove one of the axles and it turns into a fwd car.

For the $6000 you're going to be limited to the 98 to 2000 range. The 2001 is not a bad model but there are some transmission issues on 01's and 02's. I have a 01 T5 with 141K on it and it has no transmission issues. I also have a 2002 S60 that has the transmission issues that showed up at 75K miles. It is a shameful excuse for a transmission so one should beware. Ruling out the 2001-2002 leaves you with the 98's thru 00's.

Just my opinion.